AD9511SLASHPCB datasheet(30/60 Pages) AD

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AD9511

Rev. A | Page 30 of 60

Table 14. PLL Prescaler Modes

Mode

(FD = Fixed Divide

DM = Dual Modulus)

Value in 0Ah<4:2>

Divide By

000

001

P = 2 DM

010

P/P + 1 = 2/3

P = 4 DM

011

P/P + 1 = 4/5

P = 8 DM

100

P/P + 1 = 8/9

P = 16 DM

101

P/P + 1 = 16/17

P = 32 DM

110

P/P + 1 = 32/33

111

When using the prescaler in FD mode, the A counter is not

used, and the B counter may need to be bypassed. The DM

prescaler modes set some upper limits on the frequency, which

can be applied to CLK2. See Table 15.

Table 15. Frequency Limits of Each Prescaler Mode

A and B Counters

The AD9511 B counter has a bypass mode (B = 1), which is not

available on the ADF4106. The B counter bypass mode is valid

only when using the prescaler in FD mode. The B counter is

bypassed by writing 1 to the B counter bypass bit (0Ah<6> =

1b). The valid range of the B counter is 3 to 8191. The default

after a reset is 0, which is invalid.

Note that the A counter is not used when the prescaler is in

FD mode.

Note also that the A/B counters have their own reset bit,

which is primarily intended for testing. The A and B counters

can also be reset using the R, A, and B counters’ shared reset bit

(09h<0>).

Determining Values for P, A, B, and R

When operating the AD9511 in a dual-modulus mode, the

input reference frequency, FREF, is related to the VCO output

frequency, FVCO.

FVCO = (FREF/R) × (PB + A) = FREF × N/R

When operating the prescaler in fixed divide mode, the A

counter is not used and the equation simplifies to

FVCO = (FREF/R) × (PB) = FREF × N/R

By using combinations of dual modulus and fixed divide

modes, the AD9511 can achieve values of N all the way down to

N = 1. Table 16 shows how a 10 MHz reference input may be

locked to any integer multiple of N. Note that the same value of

N may be derived in different ways, as illustrated by N = 12.

Table 16. P, A, B, R—Smallest Values for N

FREF

FVCO

Mode

Notes

P = 1, B = 1 (Bypassed)

P = 2, B = 1 (Bypassed)

P = 1, B = 3

P = 1, B = 4

P = 1, B = 5

P = 2, B = 3

P/P + 1 = 2/3, A = 0, B = 3

P/P + 1 = 2/3, A = 1, B = 3

P/P + 1 = 2/3, A = 2, B = 3

P/P + 1 = 2/3, A = 1, B = 4

100

P = 2, B = 5

100

P/P + 1 = 2/3, A = 0, B = 5

110

P/P + 1 = 2/3, A = 1, B = 5

120

P = 2, B = 6

120

P/P + 1 = 2/3, A = 0, B = 6

120

P/P + 1 = 4/5, A = 0, B = 3

130

P/P + 1 = 4/5, A = 1, B = 3

Mode (DM = Dual Modulus)

CLK2

P = 2 DM (2/3)

<600 MHz

P = 4 DM (4/5)

<1000 MHz

P = 8 DM (8/9)

<1600 MHz

P = 16 DM

<1600 MHz

P = 32 DM

<1600 MHz

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